One vertex per element, one color per generator, with an edge from x to x·s.
(1,2,5,10,6,9,4,8)(3,11,12,16,13,7,14,15)(17,18,21,27,20,26,34,45,23,29,37,46,22,28,36,38)(19,25,31,42,33,44,48,40,32,43,47,39,30,41,35,24)(1,3)(2,7)(4,12)(5,14)(6,13)(8,15)(9,11)(10,16)(17,19)(18,24)(20,30)(21,35)(22,33)(23,32)(25,38)(26,39)(27,41)(28,42)(29,40)(31,36)(34,47)(37,48)(43,45)(44,46) involution — undirected(1,4,6,5)(2,8,9,10)(3,12,13,14)(7,15,11,16)(17,19)(18,25)(20,33)(21,31)(22,30)(23,32)(24,38)(26,44)(27,42)(28,41)(29,43)(34,48)(35,36)(37,47)(39,46)(40,45)(17,20,23,22)(18,26,29,28)(19,30,32,33)(21,34,37,36)(24,39,40,42)(25,41,43,44)(27,45,46,38)(31,35,47,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.